General Science • ChemistryMedium
What is the common mineral name for anhydrous aluminum oxide containing traces of titanium and iron, which forms valuable gemstones like sapphire and ruby?
A. Feldspar
B. Corundum✓ Correct Answer
C. Cryolite
D. Bauxite
💡 Solution & Explanation
Corundum is a crystalline form of aluminum oxide that serves as the base mineral for precious gemstones like rubies and sapphires, with its color variations caused by trace metallic impurities such as chromium or iron. Feldspar and bauxite are distinct silicate and aluminum ore minerals respectively.
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